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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1db1f34e35d0a98ff53d2b35fb6ff1778c7c17c08e53b0ebddb5246e83cbfd7' 
  AND token = '1ZzfINV19BdutrEzGZ2Fvrz2NH46Othoc6DPKXZSvDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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