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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f747886c0642215918ea62cb3591965af7c489fd624516631ae0f9785c20ea2' 
  AND token = 'rQiutq0Qj7HAwtkgoLFF4/7ycecka8JF7UJ2Rsb5xB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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