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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe32f2b372b2dd760030a9875b76c263f454686f7293ba8dc3118be0c3a9e5ff' 
  AND token = 'mVZyCT8u6YVRd7IvEJaoAvltytTsj457jDylAiPUZx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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