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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c92eda32dd45c1ed0832b0cb7dc3a689996cffcac3b0e6a267448f393f770f' 
  AND token = '9D3RaH6gWrRkBdQVUOZaEH2/4cgMXy7zjbI04lECUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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