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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfef30cba1c617492ee668a19c49a88cb5b40d705be53514ffb5b7b51cd4f2c' 
  AND token = 'HIqJwmObV0YfrDRud07N2ElzW4+Pt5KQbMik5TwABl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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