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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0968030586f0daed0640338b600374f3c54c1e1994003097e0e812393b1f72da' 
  AND token = 'XQRO9+5+NP0e9NsLt1cgM+z6FwM/2Zs2SPTkJHmtIxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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