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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f2d832486e16f26be7a9df5868691ae54f402c011df604e38f938cab8af3cd' 
  AND token = 'lee97S1QZaJb1OvAJJ/BMxP7DdvAOSJ6xk64vzf2L0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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