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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d310c035185afdd7bfe89b5d79f99912ad242bfc84959b87d54f2558f9a795' 
  AND token = 'qzhRDtMGCdNmLIiVuF4CO8ggWS0DB33PW5UyXt3Uenw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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