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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac69b319f92a5a0c547dc2643a63cd2fb2c8d99758ad6e1c182edc40d3d38377' 
  AND token = 'i1FGt8PmzehYYUKsroc1ksK1hxDXIg0qnVWnpMhGG8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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