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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e629ddb7732f430bf0dd35e943df4eeb5a4f80f80a60a51f86bb64487789e4f' 
  AND token = 'b8pQab26QRX95h6sbegYM4WPtqXuGDjEu8S+AtnyhU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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