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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1aba00ed4c737c8e7f6a9531668ac74899e5d83c63107c7af63e70fc2796dc1' 
  AND token = 'n8XQBRd2v7+YOwB1fOrIYnduKOkA3gscIJnPHlssMP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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