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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da9a31df83b6fc9a6203232005b2ba07003310b4b672d8816b84c2ac9440549' 
  AND token = 'ksde/SMjkutb27TzlNkGX759MEXf3ltFm2M7iUpiW0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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