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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c0406679c978623051248a58fdd9ed1f262b6202ec0812bbede0706fe03fb6' 
  AND token = '7CBwEGHealux5CY2HR4OqpI58tjbjrg1Srk8HF7eR48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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