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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98ca08b04107badaf34f367713e3e82eff034bfabc123bba67a5b9ea5a9bf4' 
  AND token = 'fV9gEoV4cX2ySixJ3TxRyg5riYS9M2aVlxhfHaLcRH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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