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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d33f515147200027d18f23218cc063c3a9ccbd2d0be8830a4c24477d49427e' 
  AND token = 'F80j/L0M6YvcqXyZfSTRjtbuDFeoS7A5VCD3i59RWX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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