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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76358854f944ef4a5cc6a9e737a62ccdebbecb63be8a0657ebfd065484ac9de4' 
  AND token = '0G5D7Bel0giPs0zbWi/n+6rlDlFElYoNUtR3omAVVoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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