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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4d347e9fa453a55b754e0be8f84773954e25ff1a0be24dc2fd0ee14abef2cc' 
  AND token = '1buT6t4oqMnPiznYB5giUOlAcgRFSY6wM17vA39jm7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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