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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd877a4834003f8b28096e14344120deb3a44a0358b1c292db01f90df2bf826' 
  AND token = 'U4ejv6UbVUT5B5IGtR2oHWBGUauVTvUAkZQdXkrVnSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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