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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f8e874faee46438edb5b13cdbe5358440126b551167aa0f0ecff6a4752a5e9' 
  AND token = 'cwdjMIP0OjjEJNdWWpVuKVLorF4wnwdZbcmJjq5TNnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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