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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec599e8fde48ef6453efef89323332333c1e234ebdb89d842cb6725557c12d13' 
  AND token = '+DBZmDks7mn6paw3uzP6yJtxclMmb6uPYiuc3S9zobo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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