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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff474f21d1c1b05b35c067537535029fc9d1e98fafe69f97cde0185e0375205' 
  AND token = '87gNHv1/uk17iEkhTQOVzOv6CvMnFMAYY0nsj61pUPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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