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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58139ac4246f8d1830feec65cd0222e15e32bf1fb4fd087365295929eb7ef0ff' 
  AND token = 'AqzLaysje0hn5mFyTseQ5MgM7c3gr5lykQLs/F2dOvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}