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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec632834b9052ad89c6fd8faf657eb774992d6168e5af09078dedd493ad54c1' 
  AND token = 'PBL86Xyom6W9T/TJ3FRb2zoZcyOTNHMd2SwaBMTqDlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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