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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db06d38e69e89bf0b9faba75d9445724b1a84db8cacaffc26ad6c5d4f63db008' 
  AND token = 'Hxzmp6aLa/79AWfCvRsG032cAf43uzX3N14NCRTq/kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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