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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffd9d5191c36de0fd6bb59616c0500dc89f1f36ef4ebc5cffd77e46d7696c08' 
  AND token = 'Kgqk+SFg4Lj+ldeujAfC77gaRbiB5w2cTfWPB6G9qT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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