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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f28ab8bb62e4fa7b4e134da7d34b73013cae502a0f4857e8c3222572b9a7e8' 
  AND token = 'uMxo6x80AqRMmmfx83c6AE0rJ+jQB2iBWNm4H50g9y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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