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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0afda0e999b386e4e2229eaa5d7b70194ed3ac6a6639380aa0dcc37334c2b82' 
  AND token = 'nXOcXWLskjg3TsrscezN7fdW37cfsqZI/1nHa/UN9K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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