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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58a8eb829dc062b4423306a15d54a7630e520b30fd295129ad5af699542b096' 
  AND token = 'pAEqPu2s5WSmMS3bAjS1B7QJRdgwQmX26KyXPfzw+Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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