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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d39a76e9a6e432ba2a75e1d4417c3c4faaefe9520164053670ba3449c097a66' 
  AND token = 'wb4VT8Ah+viPq4zznxty4qJf1T3xGG1S5ABucTrfnZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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