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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504cba0185c4fdf03be564a247327ede40637e206c5390460d92e7bd9791891c' 
  AND token = 'o235ld8Tphk5o9qlOx9UfaLErhNTd+a30jg6NWRtZcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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