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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84bde97b143de7a11973dc164ce2b4c3e99a6e3da55aa54b4137f1d54c545cc' 
  AND token = 'A52n1BGL53Zi9HnQ5o5VIuC1rO0MT+ECWTKojeVwGTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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