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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb05f45a0e42cf2de2103890ce64bd274acea1d6c4999f299e06f636d8158893' 
  AND token = 'x6U0a7Zd6KJM254bRdt0SWtjscbD7bMUjW5tSf+Qtwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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