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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa913f28f5b4c1bc3229c0e2dbb99fef9a51a3dd93aaf1eb514d6fe7184ebb3' 
  AND token = 'BOwdYdoEIV62lyBOWTfv51uBa8lucz+F6837nZZDDj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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