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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad635f2b2d5853f7a492bf1df200621451a120927c87e821e60a7c5fd5c5b9d' 
  AND token = 'oAU4amug5wV616D1fW+ZeZD8i/hB+sJiev2MUYdecVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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