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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb2d632ab2e18c14e702f9e54220b9d8f112d9489a215c8301d37c304218ead' 
  AND token = 'QvS/y9PovhWDuo395OW9FLzBVcXFM1i0ozjgXRVXKxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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