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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3faf119ae69c77a3392d17ebeba9e3f83c8f347fa21dead668f7e32c54004d' 
  AND token = 'noCyyUND0Ue0ngCrCt3dBbNlPw49g5M+Q3/ds0WDGeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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