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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3b51fe25efa3787968b43e4b9f72563e7b5f8f9bae3a9feca6689eb1afef82' 
  AND token = 'tdEajf+MHHA15sYlaece6aW1OOjl2nQMkrrhh/d7q30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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