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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f286954dac41f1b5c982d9f91e0233a7b3b577af3750055196f42d2ca01fef6' 
  AND token = '4OjVeBi9lSM9I1Fn/ML8vWW9F9WrkyRs8e8q7s9aG48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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