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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a264a852f3a6bb8781165f5c5c6c624fe8e68f69b3f1565d25b5504481223c' 
  AND token = '0QMJm+oJ5+/0e/1b020aZEwhkfZZHSUVCFkP0sCrSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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