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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98706f84e754d67cb2d5daf18dbecadf3c41559ab09a2127f7d768d4f5ff2d03' 
  AND token = 'n9NHESDH390FFeBOhJ1mtSVhwtjIA0ZSXCW2POoTB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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