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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ee76f14c98af236a544eec7bfd1ee70ad344ae02fa90391ee8896c9081b73f' 
  AND token = 'QvLNbIwolQJns5HZZVEEx0zOJmStHPejQkG5mr0YizM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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