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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd965f825b03e46657eccbb5c3dad89ee0eceaa45c686c931fc7612b98fd18ce' 
  AND token = 'f1p6i4vmDm0VTg52NRuN/ldTZR04wKUdofB4l5zVjXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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