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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55da87ea58dad82f54c11dd5267d4f82d89f6876180464999d2617f5600ec2c3' 
  AND token = 'njNpYOBvUPiU0WxQ2VXZQr/sjFMUXd0NDPoEEj1LRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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