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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da13c833ca7b2529c83d7e16b0479645ea2985a58e6d402c4704c8fed062cec9' 
  AND token = 'zywC60uXEPeuCtFd5UFFtOZflUOE1Y7Uwb4IekeJDhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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