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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f52e604573fd559c7bacaa50ac7060b1ec0ebdda63b6ea770c1b51cec44afd' 
  AND token = '0HJO5k/n3+pvhVj4Fmg00cXkgKGe9Pv9Vwmz7bSrAQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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