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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef7be1f9f7c8cce5b00b4ecc884201a14b3ed26b3ca795f33e5b595bdc1f119' 
  AND token = 'KK92cnzSq+fKQsnWXjO1jbzGXWrEvX8XddfHg49Wo3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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