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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3036bdafcdf38e402da6f18e56cf9d2e2aea0ec11f74b750a861a9404052ab8a' 
  AND token = 'mlo0UQj0aYmJhIjThZB3vkfL7PlWblBCaw41C39spSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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