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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc99771a0c2369207720e04956e76fe61d160153a2019adba1c5eec419cce32' 
  AND token = 'Lfy9QCG+JU8lORI1jpMyJGUtbLxQV6+xLzBzUhoJDB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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