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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accdb1194d8f035527221c2938b5a98e32a763efb476d31d2aa1323d26084d70' 
  AND token = '0vzP37kF5cIBd3Z5LKd+YhKfSSEMrt2ndO6/3an7qPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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