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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d18817db7a6a7ee1caa06b08433c53e2eee5d464908cd239c52ac5750b441f' 
  AND token = '7n6zuBijPOvnBUMjv1igSq/I0ptn8C10e16xIzq8KC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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