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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98e236c049dec4e24a15017f290f78ce9d628b4753f5cf480b2ff60cf215c9e' 
  AND token = 'A64iOfG0IxegWy2ROWpnOHYqr65Xol3bkMLfac5j1os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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