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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bce65d5ecd4f1093c1fb0b4f2fa6c36d05aebc97fb5bb1627bd5ec8a427402' 
  AND token = 'b0ZurXT7xq0CF7hWaJH0lZOZjBGv9PrBmdeGxJigHGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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