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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4176514e247482d857ba8f3fe03aa7e72d484c25ed56eef53d5d73924043196d' 
  AND token = 'X1jRH5HwX60UEamgLs5L+qiu4WsFZq19bqaGAhqJ3s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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