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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17e6d74968831827a3a6c820762a2cc33c8cbbed5f75f12bb44ba617d7638e3' 
  AND token = 'iYpJckM1isasQQi63BnHrCA4voLyyqknja520Xr7xIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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