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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d60ba7d586a7ff09506a926d8ed8d2e90b7db96aa6bd1c6bcf1c186340b3e2' 
  AND token = 'axjFr2+haDedYx9OuMnYXwYJpq//fpsV9HTaBH933d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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