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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ef30a8cb8eedbc7ea551979aa813dad6d2e99b6150d6384303ac79950a4bb6' 
  AND token = '6wXWYMaeeVB1N8GQFWzJWASRWIeB6itTo6hmL/cMmPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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