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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ce4381c11755333e069e7662c45a57429f7949f438df07c0f3f2f2d4e2505a' 
  AND token = 'ec285O6nYP0k6fbe9760J/uJj3Jx/JMbIRUzbKRV5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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