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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e90c6573c25dc5d999e9a978b220c67d89d5760bea8a3ce9799025b21d7fffb' 
  AND token = '7ZKuliDxHBQ+iUmlB2DiQrvBwbJ73nyYqM1RAgSQ7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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