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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0000de2dc551ebaafe25f65211a8d04f8774ac3c767cca86f3942ae035f461' 
  AND token = '1sl9YtHZJxNEA4x/EgHE5z7h7cfIKdf056fu55qyuXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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