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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b4085f1da20c8af77051e4d5b30b9a6dd6b085d9c2d3207831bef8914ebab3' 
  AND token = 'bRHIXGoGuKGKQ2NgEN4Epmw9kUFGzMV3wtjFptFnFRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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