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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93228dba35c96c4053efc6694f86038c0a3017b5bc79f6936e10c3bdfb385a9c' 
  AND token = 'F4rHUi8mTCfkxdzG8Sgnv1/78WzR5UCLeWRAxKJGFzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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