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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e058a2afef7f852d92d0332185e1a6b2f42fce8c69634f7e02c2b1cd059ec1eb' 
  AND token = '9WEQgMkt/mSyIq80Nxmj/Les0yc/soJf/C5wlToLrQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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